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PROCESS 0F AND APPARATUS FOR COVERING WIRE TTTTTTTTTTTT S.

( N 0 M 0 d e l l w l e www N i NiTED STATES 'PATENT l' muc..

ETTORE ALBASINI, 0F TURIN, ITALY.

sEcIIcATIoN forming part of Letters Patent No'. 614,819, dates November 29, 189s. Appiimiontiea my 28,1898. senti No. esaooz. (No man T0 all whom) it may concern.-

Beit known that I, ETTORE ALBAsINI, a subject of the King of Italy, and a resident of Turin, Italy, have invented certain new and useful Improvements in Processes of and Apparatus for Covering Wire with Asbestos, of which the following is a specilication.

It is known that asbestos would be the best material for covering metallic wires (or wires composed by other suitable materials) intended for the electrical transmission and other applications requiring a good insula-v tion, such as the winding of bobbins for electrical machines and apparatus, telephones, telegraphs, or the like; but it is, however, also known that the application of asbestos to such a use has been as yet prevented by the excessive cost of the employment of said insulation in the usual form of threads by plaiting or twisting which take the place of the cotton, silk, or. like covering. The principle of the present invention is to render practicable the application of asbestos to said uses, employing it not in the form of threads, but in the natural state of the sliver, which is obtained by working it by acomb. To obtain this result, I cause the wire to be covered to pass immediately below the sliver of asbestos, which is developed from the combingcylinder of the carding-machine under the stroke of the comb (or other similar doting mechanism) and parallel to said sliver. The sliver of asbestos then attaches itself by wrapping itself around said wire. This obtained it is necessary that the sliver of asbestos wrapped around the wire should roll well to this in order to form a perfect covering, compact and even. To this end an apparatus or suitable cylindrical tool serves, represented as an example in the hereto-annexed drawings, in which- Figure I is a longitudinal section, and Fig. 2 a transverse section, of the same tool.

Such an apparatus consists, essentially, in a cylinder A A, having a bore in the form of a cone B along its axis and revolving within a bearing C G. To this cylinder is joined solidly a pulley D D, likewise bored conically with relation to its axis, integral with which is a metal plate E E, in like manner conically bored relatively to its axis and upon which are mounted three or more small conical rollers, as F F F. The disposition of these small rollers, which can be caused to approach one another more or less by means of screws or otherwise, is such that the space inclosed by them forms a continuation of the conical bores just referred to, with which the said cylinder, pulley, and plate are furnished. These cylinders, moreover, can each turn around a longitudinal axis with which it is furnished.

The tool is appliedto the carding-machine,

being arranged at one of the extremities of the comb and put in motion by means of the pulley D, above described. Then the wire, which will be caused to pass in from the other side of the comb after being passed beneath said comb, being covered by the sliver of asbestos, will be introduced, as seen in Fig. l of the drawing, into the conical bores above' described, by which means its covering, formed of said sliver, will acquire by degrees evenness and compactness. This compactness will then lastly be increased up to the desired limit of action of the compressing-cylinders F F F and might contingently even be increased further by wetting the wire as it passes out or by the absorption of adhesive substances.

The longitudinal flow of wire along the sliver and through the apparatus above described will be determined by one of the usual means which are employed for obtaining simillar results-namely, either by drawing, by

means of revolvingpressure-rolls, orby means of a winding-bobbin or the like.

`Having now particularly described and ascertained the nature of my said invention and Vin what manner the same is to be performed,

I declare that what` I claim is,-

1. The process herein described of covering wire with iibrous asbestos, consistingin feeding the asbestos to the wire and compressing the asbestos about the wire by pressure gradually andprogressively applied, substantially as described.

Y 2. .An apparatus for applying fibrous asbestos t0 wire comprising means for applying a gradually-increasing pressure to the asbestos, substantially as described'.

3. An apparatus for Ycovering wire with as- IOO bestos comprising a rotary cylinder through which the wire passes and having a conical opening for gradually compressing the as bestos about the Wire, substantially as de-` In witness whereof I have hereunto set iny' scribed. hand in presence of two Witnesses.

4. In combination in an apparatus for cover- I T ing Wire with asbestos, the rotary cylinder ETTORE ALBASII 5 having a conical opening through it and the itnessesz l conical rollers carried at one end of the cyl- NINO DECAMILLI, nder, substantially as described. ALFREDO ROLLAL.V 

